There was no air lock for the compartment. The half of the detachment not on duty would walk in, seal it up, turn on the equipment, wait until the gauges registered sufficient air and heat, and then remove their space suits. When it was time to leave, they would don suits, open the door, and walk out, and the next shift would enter and repeat the process. Earlier models had permanent compartments, but they took up too much room in craft designed for carrying as many men and as much equipment as possible. They were strictly work boats, and hard experience had dictated the best design. The rocket launcher was already set up near the boat. It was a simple affair, with three adjustable legs bolted to ground spikes. The legs held a movable cradle in which the rocket racks were placed. High-geared hand controls enabled the gunner to swing the cradle at high speed in any direction except straight down. A simple, illuminated optical sight was all the gunner needed. Since there were neither gravity nor atmosphere in space, the missiles flashed out in a straight line, continuing on into infinity if they missed their targets. Proximity fuses made this a remote possibility. If the rocket got anywhere near the target, the shell would explode. Rip found his astrogation instruments set carefully to one side. He removed the data sheets from his case and examined them. Now came the work of finding the spots in which to place his atomic charges. Since the computer aboard ship had done all the mathematics necessary, he needed only to take sights to determine the precise positions. He took a transit-like instrument from the case, pulled out the legs of its self-contained tripod, then carried it to a spot near where he had estimated the first charge would be placed. The instrument was equipped with three movable rings to be set for the celestial equator, for the zero meridian, and for the right ascension of any convenient star. Using a regular level would have been much simpler. The instrument had one, but with so little gravity to activate it, the thing was useless. The sights were specially designed for use in space, and his bubble was no obstacle in taking observations. He merely put the clear plastic against the curved sight and looked into it much as he would have looked through a telescope on Earth. As he did so, a hint of pale pink light caught the corner of his eye. He backed away from the instrument and turned his head quickly, looking at the colorimeter-type radiation detector at the side of his helmet. It was glowing. An icy chill sent a shiver through him. Great, gorgeous galaxies! He had forgotten ... had Koa and the others? He turned so fast that he lost his balance and floated above the surface like a captive balloon. Santos, who had been standing nearby to help if requested, hooked a toe on the ground spike, caught him, and set him upright on the ground again. "Get me the radiation detection instruments," he ordered.